All you have to do is leave the bulding then imediatly return. leaving the building triggers it to finish. so the time depends on you.
Chat with our AI personalities
walk out and in again and ta-da! you have a Pokemon extracktid from a fossil
take it to the pewter museum and talk to the guy with the black hair he will take your fossil and make it into an omanyte
As soon as you give it leave the whole building go back inside talk to the guy who took the fossil to receive your very own Lileep(root fossil) or Anorith(claw fossil).
Actually not long at all simply give the fossil to the scientist leave the Devon corp go back inside and talk to him the fossil will be revived!
Make sure you have put the fossil in you bag. Press Y and select treasures select the fossil and select put into bag. Then you will be able to exchange it for a Pokemon.